US20230124564A1 - Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case - Google Patents

Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case Download PDF

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Publication number
US20230124564A1
US20230124564A1 US18/085,638 US202218085638A US2023124564A1 US 20230124564 A1 US20230124564 A1 US 20230124564A1 US 202218085638 A US202218085638 A US 202218085638A US 2023124564 A1 US2023124564 A1 US 2023124564A1
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US
United States
Prior art keywords
case
polygon geometry
base
base part
base body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/085,638
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English (en)
Inventor
Stefan Wosch
Marcus Singer
Murat Arbak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diehl Metall Stiftung and Co KG
Original Assignee
Diehl Metall Stiftung and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diehl Metall Stiftung and Co KG filed Critical Diehl Metall Stiftung and Co KG
Assigned to DIEHL METALL STIFTUNG & CO. KG reassignment DIEHL METALL STIFTUNG & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARBAK, MURAT, Singer, Marcus, Wosch, Stefan
Publication of US20230124564A1 publication Critical patent/US20230124564A1/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/0823—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition
    • F42C19/083—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition characterised by the shape and configuration of the base element embedded in the cartridge bottom, e.g. the housing for the squib or percussion cap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/04—Shaping thin-walled hollow articles, e.g. cartridges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B21/00—Depth charges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/26—Cartridge cases
    • F42B5/28—Cartridge cases of metal, i.e. the cartridge-case tube is of metal

Definitions

  • the invention relates to a base part for producing a cartridge case, the base part having a case base for receiving a primer cap, wherein a circumferential extractor recess is provided on the outer circumference of the base part.
  • the invention further relates to a cartridge case having a cylindrical case which has a case opening for receiving a propellant charge and a projectile, and also has a base part opposite the case opening.
  • the invention relates to a method for producing the base part and the cartridge case.
  • European patent EP 2 690 391 A1 discloses a method for producing a cartridge case.
  • an extraction groove in the form of a circumferential rotational surface is produced in a casing blank by reshaping the blank.
  • a relatively complex reshaping tool is required, which contains a place marker among other things.
  • the place marker in turn has 6 to 8 segments.
  • U.S. patent Ser. No. 10/041,770 B2 discloses the production of a cartridge case with a two-part design.
  • a base part provided with a circumferential extraction groove is connected to a case.
  • the production of two-part cartridge cases is also complex.
  • the problem addressed by the invention is that of eliminating the disadvantages of the prior art.
  • a base part for producing a cartridge case and a cartridge case which can easily be produced should be specified.
  • methods for producing a base part and/or a cartridge case which can be carried out as simply and cost-effectively as possible are specified.
  • the extractor recess has a polygon geometry which is formed from a closed traverse in cross section.
  • the extractor recess is configured as a groove and therefore as a circumferential rotational surface which forms a circle in cross section.
  • the proposed polygonal shape of the extractor recess can be produced in a simplified manner, in particular by means of reshaping methods. During reshaping, material can flow from the middle of each path of the traverse towards the corners bordering the paths in cross section. Surprisingly, it has emerged that the functions of a traditional extraction groove are also satisfied by an extractor recess which has the geometry of a polygon.
  • a “base part” within the meaning of the present invention is normally a body with a cylindrical design, at least sectionally.
  • cross section refers to a sectional plane which intersects the cylindrical axis perpendicularly and runs through the extractor recess.
  • extractor recess refers to a depression extending radially inwardly from the outer circumference of the base part or a base section.
  • the extractor recess may be produced, in that it is pressed in from the outer circumference by a radially inwardly acting force.
  • cylindrical portions starting from a profiled base body, for cylindrical portions to be formed on both sides of a profile section by radially outwardly acting forces, so that the extractor recess results.
  • At least some of the paths forming the traverse are straight. All paths are preferably straight. However, it may also be the case that at least some of the paths forming the traverse are curved (e.g. convex or concave).
  • the paths are usually delimited by corners in the traverse. The corners may also be rounded.
  • the traverse is rotationally symmetrical in relation to an axis of rotation.
  • the traverse may, in particular, have 2n-fold rotational symmetry in relation to an axis of rotation, where n is a number 3 .
  • the polygon geometry may be configured as a regular hexagon, octagon, etc.
  • the case base has an opening for receiving the primer cap.
  • a base part having the aforementioned features may be configured in such a manner that it is suitable as an assembly part for producing a cartridge case. However, it may also be configured in such a manner that the cartridge case can be produced in part by means of a further forming method.
  • a cartridge case with a cylindrical case which has a case opening for receiving a propellant charge and a projectile, and also a base part according to the invention opposite the case opening.
  • the cylindrical case and the base part may have an integral design. However, it may also be the case that the cylindrical case and the base part are fixedly connected by means of joining technology.
  • the base part may be welded to the case, for example.
  • a method for producing a cartridge case having a cylindrical case which has a case opening for receiving a propellant charge and a projectile, and also a base part opposite the case opening with a case base for receiving a primer cap.
  • the method including the following steps of:
  • the proposed method supplies an integral cartridge case.
  • the base body may have a cylindrical case even prior to the production of the circumferential extractor recess. However, it may also be the case that the cylindrical case is formed only following production of the extractor recess.
  • a method for the production of a base part for a cartridge case which base part has a casing base for receiving a primer cap.
  • the method contains the following steps of:
  • the proposed method variant supplies a base part which is particularly suitable for the production of multi-part cartridge cases, in which the base part is joined to a case.
  • base body should be understood to have a general meaning. It is a metal body which may be a wire section with a cylindrical outer circumference, for example. However, the base body may also be a preform part which has already been reshaped or processed by means of machining methods. The base body may already have an opening for receiving the primer cap.
  • the polygon geometry starting from a cylindrical base body is produced by means of a reshaping method or a machining method.
  • the polygon geometry can easily be produced by means of a reshaping method, in particular.
  • a hardening of the formed zones, especially at the base section, may well be desirable.
  • the polygon geometry is advantageously stamped in an outer circumference of the base body. It has proved particularly advantageous for the polygon geometry to be produced by means of multiple shaping steps.
  • a first polygon geometry is stamped into the outer circumference of the base body and in a second shaping step, a second polygon geometry sectionally overlaying the first polygon geometry is stamped into the first polygon geometry.
  • a first polygon geometry is stamped into the outer circumference of the base blank. This can be done using a relatively simply formed shaping die.
  • a second polygon geometry that overlaps the first polygon geometry at least sectionally is stamped into the first polygon geometry.
  • the second shaping step can also be carried out using a simply formed shaping die.
  • an extractor recess configured as a polygon is obtained with a high degree of dimensional accuracy.
  • the number of paths or polygon paths is advantageously increased by the second shaping step compared with the first shaping step.
  • the first polygon geometry may have 6-fold rotational symmetry in relation to an axis of rotation.
  • the second polygon geometry may have 12-fold or 24-fold rotational symmetric in relation to an axis of rotation.
  • first edges produced in the first shaping step are at least partially over-stamped in the second shaping step.
  • first edges may exhibit a burr, or the like, following the first shaping step. Since first edges produced during the first shaping step are at least partially over-stamped in the second shaping step, a polygonal shaped extractor recess can be produced in a simple and cost-effective manner with a high degree of geometric precision.
  • a 2-part or multi-part shaping die is advantageously used to produce the polygon geometries.
  • a simply configured 2-, 3- or 4-part shaping die is generally sufficient.
  • Multi-part shaping dies e.g. 8-, 9- or 10-part shaping dies, can also be used.
  • the base body can be rotated axially by a predetermined angle relative to the shaping die following the first shaping step and before the second shaping step.
  • the base body can be rotated relative to the fixed shaping die or the shaping die can be rotated relative to the fixed base body.
  • the base body can be placed in a second shaping die following the first shaping step, the shaping die being rotated by a predetermined angle with respect to the polygon geometry relative to the polygon geometry provided in the first shaping die.
  • the edges of the second polygon geometry lie at least partially on the paths of the first polygon geometry.
  • first and the second polygon geometry can be produced using the same shaping die.
  • two identical shaping dies can be used one after the other along a forming path to produce the first and second polygon geometry.
  • the base body is advantageously rotated by a predetermined angle and then placed in the next shaping die, in order to produce the second polygon geometry.
  • the first polygon geometry is produced by means of a first shaping die and the second polygon geometry by means of a second shaping die which is different from the first shaping die.
  • a first polygon geometry with 6-fold rotational symmetry in relation to an axis of rotation can be produced using the first shaping die.
  • a second polygon geometry can be produced using the second shaping die, which has 12-fold rotational symmetry in relation to an axis of rotation, for example.
  • the first polygon geometry may be over-stamped by the second polygon geometry, in such a manner that the first edges of the first polygon geometry coincide with second edges of the second polygon geometry.
  • At least one tool can be inserted into the base body and/or applied to the outer circumference of the base body during the shaping method.
  • the tool holding, indexing, perforating, filling, stamping and/or shaping can be applied to the base body. In this way, the dimensional accuracy during production of the base part can be improved.
  • the base part or the cartridge case can also be produced from a further base body having the polygon geometry by means of a shaping method.
  • the polygon geometry of the extractor recess is predetermined by the further base body.
  • the further base body is shaped in such a manner that a cylindrical outer circumference is formed, in which the extractor recess with the polygon geometry remains.
  • the polygon geometry it is also conceivable for the polygon geometry to be produced starting from a cylindrical base body by means of rolling.
  • the opening for receiving the primer cap can be produced before, during or after the polygon geometry is produced in the case base.
  • the polygon geometry advantageously has a 2n-fold rotational symmetry in relation to an axis of rotation, wherein n is a number 3 .
  • the polygon geometry of the extractor recess may have a 6-, 8-, 10-, 12-fold rotational geometry about an axis of rotation, for example.
  • a method for producing a cartridge case having a cylindrical case which contains a case opening for receiving a propellant charge and a projectile, and also a base part opposite the case opening having a case bottom for receiving a primer cap.
  • the method includes the following steps of:
  • the proposed method provides a cartridge case, in which the base part and the case are formed from one piece.
  • the forming of the cylindrical case may also advantageously take place by means of extrusion and deep-drawing.
  • At least one tool can be inserted into the base part and/or applied to the outer circumference of the base part.
  • holding, indexing, perforating, filling, stamping and/or forming can be applied to the base part and/or the case.
  • a cartridge case produced according to the above method can be produced solely by means of shaping and therefore produced particularly efficiently.
  • a method for producing a cartridge case having a cylindrical case which has a case opening for receiving a propellant charge and a projectile, and also a base part opposite the case opening with a case base for receiving a primer cap.
  • the method includes the following steps of:
  • the joining method may, for example, be a welding method or other suitable methods.
  • the base body and/or the case is/are advantageously produced from a non-ferrous metal or steel.
  • the non-ferrous metal may be selected from the following group: brass, aluminum or aluminum alloy.
  • FIG. 1 is a diagrammatic, perspective view of a base body
  • FIG. 2 is a sectional view according to FIG. 1 ;
  • FIG. 3 is a first sectional view through a first shaping die
  • FIG. 4 is an enlarged view according to FIG. 3 ;
  • FIG. 5 is a second sectional view of the first shaping die according to FIG. 3 ;
  • FIG. 6 is an enlarged sectional view according to FIG. 5 ;
  • FIG. 7 is a perspective view of a first case forming body
  • FIG. 8 is a sectional view according to FIG. 7 ;
  • FIG. 9 is a sectional view through a second shaping die
  • FIG. 10 is an enlarged view according to FIG. 9 ;
  • FIG. 11 is a second sectional view through the second shaping die
  • FIG. 12 is an enlarged sectional view according to FIG. 11 .
  • FIG. 13 is a side view of the first case forming body according to FIG. 7 with the first shaping die open;
  • FIG. 14 is a side view of a second case forming body with the second shaping die open;
  • FIG. 15 is a sectional view through a shaping die with the case forming body received therein;
  • FIG. 16 is a side view of a second case forming body
  • FIG. 17 is a sectional view according to the cutting line XVII-XVII shown in FIG. 16 ;
  • FIG. 18 is a cross-sectional view according to the cutting line XVIII-XVIII in FIG. 16 ;
  • FIG. 19 is a perspective view according to FIG. 16 ;
  • FIG. 20 is a perspective view of a third case forming body
  • FIG. 21 is a perspective view of a first shaping die in the open state and of a first case forming body
  • FIG. 22 is a perspective view according to FIG. 21 , wherein the first shaping die is closed;
  • FIG. 23 is a perspective view of a first cavity of the first shaping die
  • FIG. 24 is a perspective view of a second shaping die in the open state and a second case forming body
  • FIG. 25 is a perspective view of the second shaping die in the closed state.
  • FIG. 26 is a perspective, sectional view of a second cavity of the second shaping die in the closed state.
  • a base body for producing a cartridge case instead of the base body for producing a cartridge case, a base body for producing the base part can also be supplied and the base part can be produced from this using an analogous method.
  • a base part of this kind can be joined to a case to create a cartridge case.
  • FIG. 1 there is shown a perspective view of a base body 1 for producing a cartridge case which is produced in one piece, e.g. by means of extrusion or extrusion and deep drawing.
  • the base body 1 has a cylindrical case 2 which has a case opening 3 and a case base 4 opposite the case opening 3 .
  • the case base 4 has an opening 5 for receiving a primer cap (not shown here).
  • a base part is indicated by the dotted line.
  • the base part may be formed from a separate base part T in the case of a multipart embodiment of the cartridge case.
  • FIGS. 3 to 6 and 21 to 23 show the production of a first polygon geometry P 1 in the region of the case base 4 .
  • a first shaping die 6 is made up of two first die halves 6 a , 6 b in this case. As can be seen from FIGS. 5 , 6 , 21 and 23 , in particular, the first shaping die 6 has a relatively simple design. It has first projections 7 (see FIG. 23 ) in the region of its first die cavity K 1 for stamping a first polygon geometry P 1 into the case base 4 .
  • the first polygon geometry P 1 is a 6-fold rotationally symmetrical polygon geometry in relation to an axis of rotation.
  • a polygon geometry, as shown in cross section in FIGS. 5 and 6 for example, is formed by a closed traverse. The paths are delimited by corners. The paths are straight in this case.
  • FIGS. 7 , 8 and 13 show a first case forming body F 1 , i.e. the base body according to the first shaping step.
  • the first polygon geometry P 1 stamped into the case base 4 has first polygon faces 10 which are delimited in the circumferential direction by first edges 11 in each case.
  • FIGS. 9 to 12 and 24 to 26 show the production of a second polygon geometry P 2 in a second shaping step.
  • the first case forming body F 1 is inserted into a second shaping die 8 which may be formed from two second die halves 8 a , 8 b in a similar way to the first shaping die 6 .
  • the second shaping die 8 has a second die cavity K 2 with second projections 9 (see FIG. 26 ), which has 6-fold rotational symmetry in relation to an axis of rotation, in order to produce the second polygon geometry P 2 .
  • the second projections 9 are rotated by approximately 30 degrees in relation to the first projections 7 .
  • the first case forming body F 1 is inserted into the second shaping die 8 in such a way that first edges 11 of the first polygon geometry P 1 are located roughly in the middle of a straight portion of the second projections 9 . Consequently, when the second shaping die 8 is closed, the first polygon geometry P 1 is over-stamped with a second polygon geometry P 2 (see FIG. 12 ).
  • a second case forming body F 2 with a second polygon geometry P 2 which has 12-fold rotational symmetry results (see FIGS. 16 to 19 ).
  • the second polygon geometry P 2 has second polygon faces 12 which are delimited in the circumferential direction by second edges 13 (see FIG. 14 ).
  • further shaping steps can take place in order to produce a polygon geometry.
  • the second case forming body F 2 can be rotated by a predetermined angular amount relative to the second shaping die 8 and subsequently shaped in a third shaping step.
  • further shaping steps can be carried out.
  • FIG. 13 shows the first case forming body F 1 with the first shaping die 6 open.
  • FIG. 14 shows, in a similar manner, the second case forming body F 2 with the second shaping die 8 open.
  • a tool (not shown here) can be introduced into the case 2 and/or the opening 5 during the stamping of the first polygon geometry P 1 and/or second polygon geometry P 2 .
  • a tool (not shown here) can also be applied to the outer circumference of the base body or of the case forming body. In this way, an unwanted reshaping, in particular a folding or the like, within the case 2 and/or the opening 5 can be avoided.
  • the arrows indicate that the tool can act in a holding, filling, stamping or shaping manner. Apart from this, it is also conceivable for the tool to have a perforating or indexing effect.
  • FIG. 20 shows a third case forming body F 3 which has a third polygon geometry P 3 .
  • the third polygon geometry P 3 may be produced, for example, in that the first polygon geometry P 1 is over-stamped with a second polygon geometry P 2 , which does not coincide with the first polygon geometry P 1 and, moreover, is offset by a predetermined angle relative to the first polygon geometry P 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Packaging For Recording Disks (AREA)
  • Forging (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
US18/085,638 2020-06-23 2022-12-21 Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case Pending US20230124564A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020003744.5A DE102020003744A1 (de) 2020-06-23 2020-06-23 Bodenteil zur Herstellung einer Patronenhülse sowie Patronenhülse, Verfahren zur Herstellung eines Bodenteils für eine Patronenhülse sowie Verfahren zur Herstellung einer Patronenhülse
DE102020003744.5 2020-06-23
PCT/EP2021/065502 WO2021259643A1 (de) 2020-06-23 2021-06-09 Bodenteil zur herstellung einer patronenhülse sowie patronenhülse, verfahren zur herstellung eines bodenteils für eine patronenhülse sowie verfahren zur herstellung einer patronenhülse

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/065502 Continuation WO2021259643A1 (de) 2020-06-23 2021-06-09 Bodenteil zur herstellung einer patronenhülse sowie patronenhülse, verfahren zur herstellung eines bodenteils für eine patronenhülse sowie verfahren zur herstellung einer patronenhülse

Publications (1)

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US20230124564A1 true US20230124564A1 (en) 2023-04-20

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Application Number Title Priority Date Filing Date
US18/085,638 Pending US20230124564A1 (en) 2020-06-23 2022-12-21 Base part for producing a cartridge case and cartridge case, method for producing a base part for a cartridge case, and method for producing a cartridge case

Country Status (8)

Country Link
US (1) US20230124564A1 (de)
EP (1) EP3986633B1 (de)
AU (1) AU2021295229A1 (de)
CA (1) CA3186714A1 (de)
DE (1) DE102020003744A1 (de)
ES (1) ES2952706T3 (de)
RS (1) RS64361B1 (de)
WO (1) WO2021259643A1 (de)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE700207C (de) * 1937-05-22 1940-12-16 Waffen Und Munitionsfabriken A Presse zum Formen von mit Ausziehernut versehenen Patronenhuelsenboeden
DE719783C (de) 1938-01-04 1942-04-16 William Prym Fa Verfahren zum Herstellen von Patronen- oder Kartuschhuelsen mit Auswerferrille
DE732984C (de) 1940-06-13 1943-03-17 Heinrich Krieghoff Verfahren zum spanlosen Herstellen der Auszieherringnut am Boden von staehlernen Patronenhuelsen
US2904873A (en) * 1956-09-12 1959-09-22 Henry F Hild Drawn steel cartridge case and its manufacture
NL169042C (nl) 1979-01-29 1982-06-01 Leer Koninklijke Emballage Werkwijze voor het vervaardigen van een bus met schroefdraad met veelhoekige flens.
US10041770B2 (en) 2010-11-10 2018-08-07 True Velocity, Inc. Metal injection molded ammunition cartridge
EP2690391A1 (de) 2012-07-24 2014-01-29 METALLWERK ELISENHüTTE GmbH Verfahren zum Herstellen einer Patronenhülse mit Auszieherrille sowie Patronenhülse
US9016184B2 (en) 2012-09-27 2015-04-28 National Machinery Llc Precision forged cartridge case
EP2918962B1 (de) * 2014-03-11 2018-04-18 Schuler Pressen GmbH Verfahren zur Herstellung einer Patronenhülse
US10495430B2 (en) 2017-03-07 2019-12-03 National Machinery Llc Long cartridge case

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Publication number Publication date
EP3986633A1 (de) 2022-04-27
CA3186714A1 (en) 2021-12-30
EP3986633B1 (de) 2023-06-07
ES2952706T3 (es) 2023-11-03
WO2021259643A1 (de) 2021-12-30
EP3986633C0 (de) 2023-06-07
RS64361B1 (sr) 2023-08-31
AU2021295229A1 (en) 2023-01-19
DE102020003744A1 (de) 2021-12-23

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